Molding-machine.



W. LEWIS.

MOLDING MACHINE.

APPLEOATION FILED MAR,15,1U1!Z.

fl SHEETS "SHEET L Y IN ENTOR WITNESSES wmwwd BY im ATTORNEY W. LEWIS.

MOLDING MACHINE.

APPLICATION FILED MAR. 15. 1912. 1 1 13 224, Patented Oct. 13, 1914. f.SHEETS SHEET 1 III IN VENTCR M ATTORNEY WTED ES 'n -irENroF-Fmn wrrlrnnnnnwrs' or minimums, rENNsYL vANIA, AssxeNon fro rim Boa MANUFACTURINGcomrANY, or PnILAnnLrIIIA, PENNSYLVANIA, A CORPORA- ,'rIoN orPENNSYLVANIA.

To all whom it may concern:

Be it known that I, W'ILFRED LEWIS, a

citizenof the United States of America, re-

Y siding the city andcounty of Philadel phia, in the State ofPennsylvania, have invented a certain new and useful Improvement inMolding-Machines, of which the following is a true and exactdescription, ref

erence being had to the aecompanyin g'draw- V ings, which form a partthereof.

My present invention relates to molding machines of the kind known asjarrers or jar molding machines in which a mold support carrying theflask, pattern orv patterns,and sand or other mold formingmaterial, isfirst lifted above and then allowed to drop back into collision with ananvil, the shock of collision being'relied upon to compact the sand orother mold forming material about the patterns. In the operat on of aJar molding machine, the'c ompacting of the sand or other mold formingmaterial depends. upon the change in velocity of the mold supportoccurring on impact with the anvil." The sand compacting etlect needs tobe varied in forming molds diiiering in charucter and, also for the bestefi'ectsin forming some kinds of molds, during.;difierent stages in 'asingle mold fodming operation.

In molding machines in which compressed air or other-pressure'fluid isemployed to elevate the mold table above the anvil the force providesimple and efi'ective means for ob taining blows of varying intensity intheoperation of a tar-molding machine of the kind 'in which the moldingtable is lifted a definite and invariable distance above the anvilpreparatory to each collision, and for obtaunn a desirable reduction inthe mower Specification of Letters Patiint. Application filed March 15.1912. Serial No,- 683;!77. c

uoLnINe-MAcIIINn.

Patented ea. 13, 1914.

required 'to operate the machineas the in.- tenslty of the blows struckdecreases. This I accomplish by providing means for im pressinga forceon the mold su port which both assists in the operationo lifting themold lPPort above the anvil and retards the falling movement'of themoldsupport when this movement is permitted to oceur,

and which may be readily adjusted to vary the retardation permitted. Byvarying the lifting force thus impressed upon the mold support theacceleration of the mold support as it-falls into collision withthe'anvil, and the velocity of the mold support at the instant .ofimpact may be varied to make the blow-struck at each collision equal inin tensity to the blow which would be struck by the mold support'iffalling freely from a height which is any desired fraction of the actualheight to which the mold support is 'elevated preparatory to eachcollision.

In the means shown for carrying out my invention I interp'ose betweenthe mold support and the anvil a resilient cushion and employ inconjunction therewith simple and effective means 'for varying the forcewith which this cushion tends to hold the. mold support and anvil apart.

' An important advantage. of my invention consists in the fact that itpermits the use of a-very simple cam or mechanism for alternatelylifting the mold support above and allowingit to fall back intoengagement with the anvil while at the same time the have illustratedseveral forms in which my invention may be embodied.v

Of the drawingsfrgur'e l is a sectional elevation of a molding machineembodying one form of my present invention. Fig. 2

'- able as in the so-called shockless ar moldseat or a sprin Gr isinterposed between a modified form of mol ing machine, and Fig. 4 is apartial sectional elevation and\ Fig. 5 is a plan view of a thirdmodification,

of my invention. In the drawings, and referring first to the.

construction shown in Figs. 1 and 2, A rep-.

resents the anvil of the moldingv machine which may be stationary or mabe moving niachine described and claimed in my Patent'No, 941,999,granted November 30,

1909. As shown the anvil A is provided at its upper end with an impactface A surroundin a tubular extension A of the anvil.

The mo d support Bis. formed with cylindrical' portion B onits-underside which slides on the tubular extensionlA The cy- 4 "20-lindrical portion B' is provided with astriking' shoulder B at its lowerend. (1- repre sents. the usual impact receiving washer interposedbetween the striking surfaces of the anvil and mold support. A.represents a guide in secured to'the anvil and B an aperture A throughwhich the pin A passes, these parts being employed to prevent the nioldsupport from turning on the anvil extension A. A rod-like member Dworking within the tubular anvil-extension A and formed with an enlarement D at its-upper end, serves as a E interposed between the member Dand t e mold support and also as a piston-like guide loosely fitting thebore of the tubular extension A. At its lower end the member D ispivotally connected as by the pivot pin D to a lever F movable withinslot A? in the anvil and pivotally' connected to the anvil by the pivotpin A. The outer end of the lever F engages a spring abutment member Gwhic bears against a pin F journaled in the lever F. This spring abut--ment member G and a. co-acting spring abutment memberf G are aperturedto loosely receive a rod G nected at its lower end to a bracket member Aconnected to the anvil member. A spring the spring abutment members Gand G5 and a nut G working in the upper threadedend of the rod G forms ameans by which thetension of the sprin G may be adjusted. 'As shown thenut x is formed with a hand-wheel G by which it ma be. manuallymanipulated. The lower en of the member D is adapted to be engaged bya'cam H carried by a camshaft H. The latter is journaled in the anvilmember and adapted-to be coupled to a In operation the cam is rotated inthe dimold support begins.

the difference between the weight 0 extension 'of the mold support' Thelatter is pivotally con- "rection indicated by the me whilethe liftingportion of the camfmenphery (are h h 71. moves incontact-with the lowerend of the member D the latter is, raised a'nd'the mold table is,correspondingly 1i the anvil, and whenthe. movement of the cam in eachrotation carries the cam shoulder h tothe right of the member D,thefalling movement of thememberiD and the the mold support, when thusdisengaged the cam to move into collision with the anvl and the velocityof approach of the'anvil and mold suPPOr-t 'at the instant ofcollisionde pend in partlupon the resistance to the fallfted' above Thetime required for ing movement of the mold support due to the spring GThe force giving the mold support its downward movement when the campermits this movement is obviousl equal to the mold support audits loadand'the lifting force impressed on the mold support through thelever F,member D and spring E. By suitably-adjusting the tension of the springGrthe sand compacting effect of thecol-lision of the moldjsupport andanvil maybe varied as desired. Moreover, the energy stored up in springGr by its'compression as the mold-.'support approaches the anvil is paidout during the followingl movement of 'the'mold support away from t eanvil. This resultsin decreasing the powerrequired to rotate the camshaft H as theforce ofthe blow struck on collision decreases. When thecamgshaftf}? is rotated at a constant movement of'the cam occurring inthe period intervening between the time whenthe cam shoulder k clearsthe member D and the instant at which impact occurs will be vanspeeditwill obvious thatthe angular able and will depend ugon the tension'ofthe spring G To t the falling movement of the mol terrupted by theengagement "of the member D with the lifting portion of the camel formthe cam between the cam shoulder hand the revs support from" beingjunpoint It with a surface h-i t--h,fwhich' is concentric with theaxisiofthecam shaft and" of such radial distance'from the latter'that itmay be engaged'by the member D without holding the impact surfaces ofthe anvil and mold support apart.

no difference, so or as the operation of 'the cam is concerned, whenimpact occurs'prm' vided it occurs while the-cam is travelingfrom theposition at which the falling movement of the mold support beginsintothe position in which the lifting portion ofthe With the provisionof the circular cam ortion h-'k h it makes port. The spring E isprovided as a cushion I wwwunnl device, to prevent sho'ck 'j when thecam initially starts to elevate .the member D. This FA between the endsof the latter.

'voir K. As shown the latter is adapted to spring has no appreciableeffect on the velocity of the falling movement of the mold m su port. 1

t will be apparent to those skilled in the art that the retarding andpower storing and restoring mechanism employed by me may be formed invarious ways; for instance, I may employ a fluid pressure cushion forthis purpose. One arrangement for accomplishing this is shown in Fig. 3wherein the machine as a whole is' identical with that shown in Figs. 1and 2, with the exception of the arrangement of the lever FAcorresponding to the lever F of the construction first described, andthe cushion connection between the lever FA and the anvil member A. InFig. 3 the lever FA has its end remote from the member D pivotallyconnected to the. anvil A at A. The stem of a piston I is pivotal lyconnected, as by the pivot pin I to the lelyler 1e piston I works in' acylinder I which is pivotally connected to the anvil at A. 1 representsa port opening to the piston chamher in the cylindermember I below thepistOn'I, and I re resents a port connecting the upper end 0 the pistonchamber of the member I to the atmosphere. A pipe J connects the port Ito a source of pressure fluid as for instance a compressed airreserreceive compressed air through pipe K from a pump or other suitablesource of supply, not shown. K represents a controlling valve in the pi'e K and K represents a gage in the pipe or showing the pressure inreservoir K. \Vith this arrangement it will be apparent that the fluidpressure cushion device interposed between the anvil and the lever FAwill exercise exactly the same mold support retarding, and energystoring and restoring functions as does the metallic spring cushiondevice shown in Figs. 1 and 2. If the volume of the reservoir K is verylargewith respect to the displacement volume of the movable-piston I the.upward pressure exerted by the fluid pressure against the piston I willbe practically constant regardless of the position of the piston I. Whenthe ratio between the volume of the reservoir K and the displacementvolume of the piston I is smaller, however, there will be an appreciabledifference between the pressures acting against the underside of thepiston I when the latter is at the opposite ends of its path of travel.The fluid pressure cushioning device, in this respect, is analogous tothe metallic spring cushion of Figs. 1 and 2 wherein thetension of thespring G will vary very little or much with the movement of the lever Fin accordance with the axial length of the spring member G when thelatter is uncompressed. The variation in spring tension in any suitablydesigned device of either type need not be great enough, however, toproduce any marked eflect and the operator can quite readily compensatefor it and obtain blows of'the..,desired in-' tensities.

In Figs. 4 and 5 I have illustrated a third form of my invention inwhich the cushion mechanism comprises pistonsM working in"- chambers Aformed in the anvil. The up; per end of each piston M bears directlyagainst the striking face 13 of thcmold' support, and pressure fluidisadmitted to the lower ends of the chambers A through correspondingports A and pipes J A which may be connected to any suitable source of}pressure fluid as for instance such a reser-l voir as the reservoir K ofFig. 3. a

While in accordance with the rovisions of the statutes I have illustrateand described the best forms of my invention now known to me it will .beapparent to those skilled in the art that changes may be made in theform of the apparatus disclosed without departing from the spirit of myinven tion, and that under some conditions cer-' tain features of myinvention may be used with advantage without a corresponding use ofother features. r I

Having now described my invention what I claim as new and desire tosecure by Letters Patent is:

1. In a jar molding machine the combination with the mold support andanvil, of a rotary cam journaled in the anvil, a lever pivotallyconnected to the anvil through which the cam lifts the mold supportabove the anvil, and means independent o f the cam l. u. for exerting alifting force on said lever assisting in the elevation and retarding thefalling movements of the mold support, said means being adjustable tovarysaid force.

2. In a jar molding machine the combination with the mold support andanvil, of a rotary cam journaled in the anvil, a lever "pivotallyconnected to the anvil through which the cam lifts the mold supportabove the anvil, and an adjustable resilient device connecting saidanvil and lever and acting on the latter in a direction to aid in theelevation and to retard the falling movement of the mold support.

3. In a jar molding machine the combination with the mold support andanvil, of a rotary cam journaled in the anvil, a lever" pivotallyconnected to the anvil through" whiclithe cam lifts the moldsupportabove.

the anvil, and an adjustable fluid pressure cushion device pivotallyconnected to said anvil and to said lever, and acting on the latter in adirection to aid in the elevation of the mold sup ort and to retard thefalling movement 0 the mold support.

4.1 ja'r mlding machifigmgcbmbhial ;in' its lvafioh; and to rtaaiitslfamn tion'with' the-mold support andzixnvil ofa rotary camjoumziled in the an ViLYfOrJIifting said niold support above andaliowing' 5 it to. fall back; into engagement with said.

anviLhnd flpidlpressute means for exerting I aflifting fqr-on s aid-moldsupport to aid movement, said means being adjustable to vary'saidlifting force. I

v WILFR ED LEWIS. Witnesses:

4H. W. BROWN R. RAYMOND fonm-

